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The Encryption (ENC) connection parameter accepts the following arguments:

NONE Accepts communication packets that are not encrypted.

SIMPLE Accepts communication packets that are encrypted with simple encryption supported on all platforms and on previous versions of SQL Anywhere. Simple encryption does not provide server authentication, strong elliptic-curve or RSA encryption, or other features of transport-layer security.

If the database server accepts simple encryption, but does not accept no encryption, then any non-TDS connection attempts using no encryption automatically use simple encryption.